Spider-Man's webbing seems to have all the right physical properties, and one of those is its ability to float. Because of that, Spider-Man is able to make himself a web-raft. The web-raft allows Spider-Man to navigate the surface of a body of water...in case he doesn't have an actual boat.
|Cover Date||Appearance Information|
|Year 1964||App: Amazing Spider-Man (Vol. 1) Annual #1 (Story 2)|